Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with a uniform composition throughout

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood

Question 3

A student measures the mass of a sample three times and gets values very close to each other, but far from the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 4

Which of the following is an intensive property?

Accepted Answer

Density

Question 5

What is the density of a metal sample with a mass of 50.0 g and a volume of 10.0 mL?

Accepted Answer

$$d = \frac{50.0\ g}{10.0\ mL} = 5.00\ g/mL$$

Question 6

Which of the following is the correct scientific notation for 0.000345?

Accepted Answer

$$3.45 	imes 10$$^{-4}$$

Question 7

How many significant figures are in the measurement 0.00420 g?

Accepted Answer

3

Question 8

Convert 25°C to Kelvin.

Accepted Answer

$$K = 25 + 273 = 298\ K$$

Question 9

Which of the following is a correct application of the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction

Question 10

A compound contains 40.0 g of carbon, 6.7 g of hydrogen, and 53.3 g of oxygen. What is the empirical formula?

Accepted Answer

$$CH_2O$$

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 12

Which of the following ions is isoelectronic with neon (Ne)?

Accepted Answer

$$Na^+$$

Question 13

What is the correct formula for magnesium nitride?

Accepted Answer

$$Mg_3N_2$$

Question 14

Which of the following compounds is named correctly?

Accepted Answer

KNO$$_3 is $$potassium nitrate

Question 15

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases

Question 16

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 17

What is the electron configuration for a neutral chlorine atom (Z=17)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^5$$

Question 18

Which of the following molecules has a trigonal planar geometry according to VSEPR theory?

Accepted Answer

BF$$_3$$

Question 19

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A double bond consists of one $$\sigma$$ bond and one $$\pi$$ bond

Question 20

Which of the following molecules is polar?

Accepted Answer

H$$_2O$$

Matter and Measurement: Foundations of Chemistry for Anatomy & Physiology

Study Guide - Practice Questions